Make workspace shared storage quota updateable

[Copilot]

This PR enables TRE administrators to update workspace shared storage quotas through the TRE interface without requiring workspace recreation.

Problem

Currently, the shared_storage_quota field in workspace templates is not marked as updateable, preventing users from modifying storage quotas through the TRE interface. This has caused issues where workspaces run out of their default 500GB allocation and administrators cannot easily increase the quota.

While Azure supports in-place quota updates for storage file shares, the TRE template schema was missing the "updateable": true flag for this field.

Solution

Added the "updateable": true property to the shared_storage_quota field in the workspace base template schema. The underlying infrastructure already supports this operation:

• Terraform uses azapi_resource with Azure Storage API 2023-05-01
• The shareQuota property directly maps to the variable
• No lifecycle blocks prevent updates
• Azure Storage file shares support quota modifications without share recreation

Changes

1. template_schema.json: Added "updateable": true to shared_storage_quota field
2. porter.yaml: Bumped version from 2.4.0 to 2.5.0 (minor version for new functionality)
3. CHANGELOG.md: Added enhancement and component version entries

Impact

• TRE administrators can now adjust workspace storage quotas from the UI
• No workspace recreation required for quota changes
• Resolves immediate need for workspaces exceeding default allocation
• Consistent with other updateable fields like app_service_plan_sku and enable_airlock

Technical Notes

When quota is decreased below current usage, Azure gracefully handles this by allowing the operation but preventing new file uploads until usage drops below the new limit.

Fixes #4314.

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[marrobi]

LGTM

[github-actions]

Unit Test Results

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Results for commit db28c85.

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[marrobi]

/test-force-approve db28c85

Not covered by tests

[github-actions]

🤖 pr-bot 🤖

✅ Marking tests as complete (for commit db28c85)

(in response to this comment from @marrobi)